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Processing method of crank connecting rod

A processing method and technology of crank connecting rod, applied in the field of machinery, can solve the problems such as the impact toughness of connecting rod, easy fracture of crank connecting rod, short service life, etc. The effect of prolonging the service life

Active Publication Date: 2012-02-08
浙江长宏科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these two processes make the surface of the inner hole of the connecting rod have a higher hardness, the connecting rod needs to have better toughness due to the continuous impact of work. The above two processes make the outer rings at both ends of the connecting rod and the ribs in the middle The increase of brittleness at the transition can not solve the impact resistance toughness of the connecting rod well, resulting in easy fracture of the crank connecting rod and short service life

Method used

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  • Processing method of crank connecting rod
  • Processing method of crank connecting rod
  • Processing method of crank connecting rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as figure 1 As shown, the processing method of the crank connecting rod comprises the following steps:

[0036] Select low-carbon alloy steel to forge a connecting rod blank 1, the connecting rod blank 1 is strip-shaped, and one end of the connecting rod blank 1 is large, the other end is small, and the ends of the big end and the small end each have a pair of opposite hemispheres Shaped pit 5. The plane at the hemispherical pit 5 is the end face 3, which is the end face 3 of the inner hole 2, and the middle part of the connecting rod blank 1 is the rib plate 4, such as figure 2 and image 3 shown. The low carbon alloy steel in this example is 20CrMo alloy steel. 20CrMn alloy steel, 20CrMnSi alloy steel, 20CrMoTi alloy steel or 25CrMo alloy steel can also be selected.

[0037] The connecting rod blank 1 is subjected to normalizing treatment at a temperature of 900°C; at this temperature, the hardness of the connecting rod blank 1 can reach HB175. After norm...

Embodiment 2

[0041] The content of Example 2 is basically the same as that of Example 1, except that the connecting rod blank 1 is subjected to normalizing treatment at a temperature of 890°C; at this temperature, the hardness of the connecting rod blank 1 can reach HB170. The thickness of the copper plating obtained after electroplating at normal temperature is 0.03mm. Carburizing is carried out in a heat treatment mesh belt furnace, heated to 850°C, the depth of the carburized layer is 0.7mm, and the hardness reaches HRC60.

Embodiment 3

[0043] The content of Example 3 is basically the same as that of Example 1, except that the connecting rod blank 1 is subjected to normalizing treatment at a temperature of 910°C; at this temperature, the hardness of the connecting rod blank 1 can reach HB185. The thickness of the copper plating obtained after electroplating at normal temperature is 0.05 mm. Carburizing is carried out in a heat treatment mesh belt furnace, heated to 870°C, the depth of the carburized layer is 1.0mm, and the hardness reaches HRC64.

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Abstract

The invention provides a method for processing a crank connecting rod, which belongs to the technical field of mechanical processing. The invention solves the problems of poor impact toughness of the connecting rod obtained by the prior processing method of the crank connecting rod, easy fracture of the crank connecting rod, short service life and the like. The processing method of the crank connecting rod A. Making connecting rod blank; B. Normalizing and copper plating treatment; C. Carburizing and quenching treatment; D. Finished product. The processing method of the present invention is simple and easy, and realizes the effect of energy saving and emission reduction, and can improve the impact resistance toughness of the connecting rod, the inner hole and the end surface have relatively high hardness, and the service life is long.

Description

technical field [0001] The invention belongs to the technical field of machinery, and relates to a processing method, in particular to a processing method of a crank connecting rod. Background technique [0002] Needle roller bearings are installed between the connecting rod and the connecting rod shaft of the general small gasoline engine crankshaft steel material to solve the friction problem. There are two ways to install needle roller bearings: the first is that the bearing has a bearing shell with sufficient hardness, and the bearing shell is fixedly connected to the inner hole of the connecting rod. Therefore, in the design of the inner hole of the connecting rod Requirements do not require high hardness. The second is to use an open needle roller bearing, which does not have a bearing housing, and the needle rollers of the needle roller bearing directly roll and rub against the surface of the inner hole of the connecting rod. This design requires a very high hardnes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16C7/02C21D9/30C21D1/28C21D1/18C23C8/22
Inventor 韩明玉
Owner 浙江长宏科技股份有限公司
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